The subject of the study is the analysis of the results of Donald Trump's tenure as president in the period from 2017 to 2020. The object of the study is the crisis of the political system and its impact on the domestic policy of President Donald Trump in the period from 2017 to 2020. The main purpose of the work is to study the activities of the non-systemic President of the United States of America Donald Trump in the period 2017-2020 to analyze the beginning of the deepening crisis of the American political system. In this work, the author used such methods as analysis, synthesis of information from documents, methods of generalization and construction of analogies to formulate conclusions, general scientific methods of induction and deduction, problem-chronological and comparative-historical methods. В The scientific novelty of this study is due to a new source base. Firstly, the research paper shows more fully than in other works of Russian authors the factors that led the United States of America to the beginning of a deep crisis of the American political system. Secondly, for the first time, a qualitative analysis of Donald Trump's populist views was carried out. Thirdly, on the basis of the studied material, an independent forecast of the prospects for the re-election of Donald Trump for a second presidential term has been compiled. The results of the conducted research prove that: to date, no alternative way out of the crisis state of the political system has been found. On the basis of an independent study, the factors that influenced the deepening of the crisis of the US political system have been identified. The deepening of the crisis of the American political system was caused by intraparty division based on the ideological polarity of the Democratic and Republican parties, the populist position of Donald Trump expressed in the growing authoritarianism of the presidential power, the free internal political will of the president-elect, the inability of the president-elect to find optimal political mechanisms for solving domestic and foreign policy issues.